Do I wait for him to contact me?

Ok I have been dating this guy. We were getting really close. PDA all that stuff. I hung out with him on Saturday and he was acting so distant. I havent heard from him since than... we normally talk everyday. So this is werid. Do I call him or text him or wait it out? Also do I ask why he is acting like this. I feel like I am playing a game and I hate games with guys.